If you are enjoying the benefits of an air purifier at home, Allergy Be Gone has all the filters and pre-filters you need to keep it in good running condition for years to come. Shop Allergy Be Gone for replacement air purifier pre-filters, including some models with carbon. Pre-filters help protect HEPA filters from larger particles, such as pet hair, dust and lint and prolong the life of your filter. Pre-filters are also great when it comes to eliminating household odors that can result from smoking and cooking. But Allergy Be Gone also carries plenty of replacement air purifier filters, which capture allergy-causing particles, like pollen, dust and spores, as well as bacteria. Depending on your specific air purifier, filters should be replaced about every three to six months.